[英]java - creating 2D array (matrix) from two 1D arrays
I seem to have suffered a ham/yam/three-bean-casserole-induced post-Christmas brain-freeze because I can't get this simple code to work.我似乎遭受了火腿/山药/三豆砂锅引起的圣诞节后大脑冻结,因为我无法让这个简单的代码工作。
Given给定
public Object[] suite = {"diamonds","hearts","clubs","spades"};
public Object[] rank = {"J","Q","K","A"};
How do I programmatically achieve:我如何以编程方式实现:
Object[][] card = {{"J","diamonds"},{"Q","diamonds"},{"K","diamonds"},{"A","diamonds}
,{"J","hearts"}, {"Q","hearts"}, {"K","hearts"}, {"A","hearts"}
,{"J","clubs"}, {"Q","clubs"}, {"K","clubs"}, {"A","clubs"}
,{"J","spades"}, {"Q","spades"}, {"K","spades"}, {"A","spades"}
};
with和
public Object[][] someMagic( Object[] suite, Object[] rank) {
Object[][] retVal = new Object[suite.length][rank.length]
// insert magic here
return retVal;
}
Yes everything needs to be Object, Object[] or Object[][] due to upstream constraints ie.是的,由于上游限制,所有内容都必须是 Object、Object[] 或 Object[][]。 TestNG @DataProvider TestNG @DataProvider
TIA, TIA,
Still-struggling Steve仍在挣扎的史蒂夫
A couple of nested loops does the magic but the dimensions of the retVal
are different:几个嵌套循环可以发挥作用,但retVal
的尺寸不同:
public Object[][] someMagic(Object[] suite, Object[] rank) {
Object[][] retVal = new Object[suite.length * rank.length][2];
int i = 0;
for (Object s : suite) {
for (Object r : rank) {
retVal[i++] = new Object[]{r, s};
}
}
return retVal;
}
Test:测试:
Object[] suite = {"diamonds","hearts","clubs","spades"};
Object[] rank = {"J","Q","K","A"};
System.out.println(Arrays.deepToString(someMagic(suite, rank)));
Output (not pretty-printed): Output(印刷不漂亮):
[[J, diamonds], [Q, diamonds], [K, diamonds], [A, diamonds], [J, hearts], [Q, hearts], [K, hearts], [A, hearts], [J, clubs], [Q, clubs], [K, clubs], [A, clubs], [J, spades], [Q, spades], [K, spades], [A, spades]] [[J,钻石],[Q,钻石],[K,钻石],[A,钻石],[J,红心],[Q,红心],[K,红心],[A,红心],[ J,梅花],[Q,梅花],[K,梅花],[A,梅花],[J,黑桃],[Q,黑桃],[K,黑桃],[A,黑桃]]
Maybe this is the solution也许这就是解决方案
public class SomeMagic {
public Object[] suite = {"diamonds","hearts","clubs","spades"};
public Object[] rank = {"J","Q","K","A"};
public Object[][] someMagic( Object[] suite, Object[] rank) {
Object[][] retVal = new Object[suite.length][rank.length];
for(int s = 0; s < suite.length; s++) {
for(int r = 0; r < rank.length; r++) {
System.out.println("s: " + s + ", r: " + r + ", card[s][r]: " + suite[s] + ", " + rank[r]);
retVal[s][r] = new Object[] {suite[s], rank[r]};
}
}
return retVal;
} // someMagic
public void doIt() {
Object[][] card = someMagic(suite, rank);
for(int s = 0; s < card.length; s++) {
System.out.println("s: " + s + "-----------------------------");
for(int r = 0; r < card[s].length; r++) {
Object[] item = (Object[]) card[s][r];
System.out.println("s: " + s + ", r: " + r + ", card[s][r]: " + item[0] + ", " + item[1]);
}
}
} // doIt
public static void main(String[] args) {
SomeMagic self = new SomeMagic();
self.doIt();
}
}
Btw: Get well and recover quickly :)顺便说一句:康复并迅速恢复:)
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